Die for trimming blanks.



R. L. WILCU'X & T. NO LAN.

DIE FOR TRIMMING BLANKS.

APPLICATION FILED FEB. 26. ms.

.0 5:. file/mm) Mari; V Vicox M41, THOMAS A/OLAN STATES, PAT OFFICE-RICHARD LESTER WILCOX AND THOMAS NOLAN, F WATEBBURY, CONNECTICUT,ASSIGNORS TO THE WATERBURY FARREL FOUNDRY AND MACHINE COMPANY, OFWATERBURY, CONNECTICUT, A CORPORATION OF CONNECTICUT.

DIE FOR TRIMMING BLANKS.

To all whom it may concern:

Waterbur county of New Haven, State of Connecticut, have inventedcertain new and useful Improvements in Dies forTrimming Blanks, of whichthe following is a specification.

Our invention relates to improvements in dies for giving a trimmed crosssection to a blank as is done, for instance, in forming the square,hexagonal or octagonal shapes of bolt heads, nuts and the like, or amanysided shape of any kind, such for instance, as a circular sectionwith flat sides, as is formed on shackle bolts and the like. It will beunderstood that by polygonal or polygon, we mean any such shape. A blankmay also be cut so as to have acircular section, and when we referhereinafter to a trimmed section, it will be understood that We mean asection of any shape which has been out or trimmed by the dies, eitherentirely around it or on any particular portion.

. One of the objects of our invention, I

among others, is; to produce a die which is provided with removablecutting edges so that they may be readily ground and sharpened, whileatthe same timehaving substantially the same strength as that of a soliddie. a i

Another object of our invention is to produce a die which will not onlygive a trimmed section to the blank but will also planish in the samedie the surfaces thus formed. y

In the accompanying drawings, Figure 1 represents in perspective anillustrative -form of die embodying our invention;

Fig. 2 is a plan view of the die;

Fig. 3 is a side elevation of one of the cutters, looking in thedirection of the arrow 4 of Fig. 2; j

Fig. 4: is an elevation of two of the cutters looking in the directionof the arrow 3 of Fig.2; 7

Fig. 5 shows a 'bolt finished from the die shown in Fig. 1; and

Fig. 6 shows a variation in the formation of the cutters.

Specification of Letters Patent.

Patented Feb. 18, 1919.

Application filed February 26, 1918. H Serial No. 219,173.

The corresponding parts are referred to both in the drawings and in thespecification by similar reference characters.

In the drawings 10 represents a body memher which, in the formillustrated, is provided with an opening 11, which in this instance, ishexagonal. The specific form of die used for purposes of illustration isintended to form hexagon heads on nuts and the like, and there areprovided therefor cutting members so arranged as to form a hexagonalopening in the die with the cutting'edges forming a hexagon of thedesired size.

Preferably each of the-cutting members 12 is given the same sectionwhich in the form illustrated is a trapezoid in which the two sideswhich are not parallel, form equal but opposite angles with the othersides of the figure. 7 The top of each of these cutters is cut away atan angle so that the cutting edges 13 will have an angular relation tothe direction of movement of a blank in the die. In the form illustratedin Figs. 1 to L inclusive, the cutters are arranged so that each pair ofthese cutting edges form opposing angles of shear.

Each of the cutters is preferably provided with a screw 1a by which itis held in the body member 10.

It will be understood that the die is used by placing it against anysuitable bench or other support, so that the longitudinal cutthe cutters12 carrying the cutting edges 13.

This is to provide proper clearance for the a cutting edges.Consequently, when the top angular faces of the cutters are ground tosharpen the cutters, the cutting edges will be somewhat farther from theaxis of the die than originally, and this will produce a blank slightlylarger than the blank out .be-

fore the cutters were ground. In order to restore the die to 1tsorlginal size, the sides of the cutters marked 4: in Fig. 2- are alsoground and then by adjusting the screws 1.4, the cutting edges 13 may bemoved to their planish the blank as it is forced between 'posesgofillustration. It will also be un-' required positions. If the planishingsurfaces 15 are formed directly on the cutter,

they must also be ground tomake the correct size; of opening. But if, asexplained hereinafter, the'planishingv surfaces are on separate pieces,nosuch grinding of those surfaces is required.

In Fig. 6 a pair of cutters is shown in which the angles of two adjacentcutters are parallel, the cutters being otherwise the same as thoseillustrated in Fig. 2. That is to say in this form of cutter, thecutting edges extend generally in the same direction from top to bottomof the die instead of in opposite directions as in theform illustratedin Fig. i, so that'inFig. 6 the chips from adjafontcutters will bethrown in. the same direction. V i

""VVhen a blank, such as a bolt head, is forced into ournovel dieillustrated in Fig. 2, thepressures on the respective cutting faces,'ina direction around theaXis of the die as'a center, will balance eachother, so

that there will be no tendency for the blank to rotate as it is beingcut. The direction of pressure of cutting is indicated by the lines a--a and b'?) of Fig. 5. With the arrangement shown in Fig. 6, since allof the lateral strain of cutting 7 .tion around the blank,there will bea tendis inthe same direcency for the blank to rotate. Consequently-the' form shown in Fig.2 is the preferable one.

In order to iron, smooth and polish the surface. of the faces formed bythe cutting ,edges 13, a slight projection 15 is preferably provided oneach of the cutters. We-have illustrated this projection as a flat facebut it will be understoodthat any suitable form will .suflice, ,so, longas it is sufficient to these projoctions. t will be understood,

moreover, that this projection is very slight and .not as great asshown, for instance 1nF1g. 3, where it is exaggerated for purderstoodthat the cutters and planishing members may be made of separate pieces,placed the one on the other, as if the cutter 50 members 12 were cut intwo along a line parallel to the base and above the planishmg surface.

, ,While we haveshown a form of cutter "which has a section adapted tohold the cutters in place in the body member after ,they have been onceassembled, it willbe understood that this is not essential, and b anyother .form of section .may be used. 'Preferably,however, the cuttersshould be arranged so that only the lateral cutting pressure is. takenup directly bythe body 'fmember 10, either directly or through thescrews 14, while the longitudinal cutting pressures are taken up by thebench or supporton which the die is placed.

If necessary, additional screws 14 may be provided to take up thelateral pressure on the cutters, or any other suitable form ofadjustment may be used.

We claim:

1. A die comprising'a body. member and a plurality of cutting membersheld therein, each of the members having a cutting edge and the membersbeing constructed and arranged and held in the body member so as I toform an opening therethrough, with the cutting edgesforming theperiphery of the opening, each of the members having a slight projectionacross the face adjacent the opening and parallel with the planepassingthrough the cutting edge on that face,

parallel to the axis of the opening.

2. A die comprising a body member and ,a plurality of cutting membersheld therein,

each of the members having a cutting edge and the members beingconstructed and arranged and held in the body member so as to form anopening therethrough, with the cutting edges forming the periphery ofthe opening, and a planishing member having its operative surfaces inthe rear of and parallel to the plane passing through the cutting edgesparallel to the axis of the opening.

3. A die comprising a body member having a polygonal openingtherethrough, a plurality of cutting members in the openof the opening,each of the cutting members having a cutting edge, the members beingarranged in the opening so that the cutting edges form a polygon similarto the polygon of the opening with thecorresponding sides of the twopolygons parallel. 4:. A die comprising a body member havmg a polygonalopening therethrough, a

plurality of cutting members in the opening equalin' number to thenumber of sides of the opening, each of the cutting members being apolyhedron with two parallel faces,

one of which is narrower than the other,

"with a cutting edge formed on the narrower face, each memberbeing heldin the polygonal opening of the body with the wider of the two parallelsides parallel with one of the walls of the opening.

' 5. A die comprising a body member hav- *ing equal in number to thenumber of sides mg a polygonal opening therethrough, a-

meager having a flat face with a cutting edge extending diagonallyacross it, the members being positioned relatively so that the fiatfaces thereof form a polygonal opening through the die with the cuttingedge on one of the cutting members forming an angle with the cuttingedge on an adjacent cutting member.

7 A polyhedral cutting member for a die,

having a fiat face, a cutting edge on the face and a slight projectionextending across the face.

8. A die comprising a plurality of similar cutting members with theirbases in the same plane and a cutting edge on each member at its top,the members being positioned in contact with each other so that thefaces having the cutting edges form a polygonal opening, and a membersurrounding the cutting members, to prevent relativ lateral movement ofthe members.

9. A die comprising a plurality of cutting members with their bases inthe same plane and a cutting edge on each member at its top, the membersbeing positioned around an axis with their sides contacting and with thefaces having the cutting edges forming a polygonal opening around theaxis, the

. contacting sides being constructed to prevent the members movingtoward the axis and a member around the cutting members to preventmovement aWay from the center.

10. A die comprising a plurality of cut ting members, each having acutting edge at its top, the members being positioned with their sidescontacting to form an opening through the die with the cutting edgesforming the periphery of one end of the opening, the contacting sidesbeing constructed to prevent the members moving toward the axis and amember around the cutting members to prevent movement away from theopening.

11. A die comprising a plurality of cutting members, each having acutting edge at its top, the members being positioned with their sidescontacting to form an opening through the die with the cutting edgesforming the periphery of one end of the opening, the contacting sidesbeing constructed to prevent the members moving toward the aXis andadjustable means to prevent the members moving away from the opening.

RICHARD LESTER WILCOX. THOS. NOLAN.

Oopies of this patent may be obtained. for five cents each, byaddressing the Commissioner of Patents,

' Washington, D. G.

